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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Mar. 31, 2023
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | 7. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of March 31, |  | As of December 31,
​ | ​ | 2023 | ​ | 2022
Land | ​ | $ | 14,953 | ​ | $ | 14,953
Buildings and leasehold improvements | ​ |  | 17,544 | ​ |  | 16,949
Vehicles | ​ |  | 1,556 | ​ |  | 1,556
Machinery and equipment | ​ |  | 5,887 | ​ |  | 5,750
Furniture and fixtures | ​ |  | 329 | ​ |  | 300
Total | ​ |  | 40,269 | ​ |  | 39,508
Less accumulated depreciation | ​ |  | (9,672) | ​ |  | (9,402)
Total property, plant and equipment | ​ | $ | 30,597 | ​ | $ | 30,106
​ Depreciation expense was $270 with $126 included as a component of cost of product sales for the three months ended March 31, 2023, and $260 with $121 included as a component of cost of product sales for the three months ended March 31, 2022.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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